Viking is the World Leader in Manufacturing Positive Displacement Pumps and Pump Accessories
Internal Gear Pumps
The internal gear pumping principle was invented by Jens Nielson, one of the founders of Viking Pump.  It uses two rotating
gears which un-mesh at the suction side of the pump to create voids which allow atmospheric pressure to force fluid into the
pump.  The spaces between the gear teeth transport the fluid on either side of a crescent to the discharge side, and then the
gears re-mesh to discharge the fluid.  Viking's internal gear design has an outer drive gear (rotor- shown in orange) which
turns the inner, driven gear (idler-shown in white).  
(click on pump to animate)
Scroll down to see all of Viking's internal gear pump series.
Heavy Duty pumps with thrust control
and adjustable rotor clearances
 Link to Universal Seal Internal Gear Pumps Link to Jacketed Universal Seal Pumps Link to Heavy-Duty Internal Gear Pumps
Universal Seal
 Jacketed Univ. Seal
 Heavy Duty
High Speed Heavy Duty pumps for
clean, less viscous liquids
 Link to Hi-Speed Compact Internal Gear Pumps Link to Motor Speed Internal Gear Pumps
High Speed Compact
 Motor Speed
General Purpose Pumps for lower
pressure, non-corrosive applications
 Link to General Purpose Internal Gear Pumps Link to Gerotor Internal Gear Pumps
General Purpose
 Gerotor
Sealless Pumps
 Link to Mag Drive Internal Gear Pumps
Viking Mag Drive
Special Purpose Pumps for specific
fluids
 Link to Abrasive Liquid Internal Gear Pumps Link to Ammonia Internal Gear Pumps Link to Asphalt Internal Gear Pumps Link to LP Gas Internal Gear Pumps
Abrasive Liquid
 Ammonia
 Asphalt
 LP Gas